Cheese Mashed Potatoes with Egg Whites and Onions

This is a recipe for making homemade mashed potatoes.
Where you add two egg whites some onion and mustard.

Ingredients:
6 potatoes, cooked and drained
3/4 cup milk
3/4 teaspoon salt or less
1/3 cup grated cheese
2 teaspoons mustard
1/4 cup chopped green onions
2 egg whites

Directions:
Add milk and salt to potatoes and mash until smooth.
Add cheese, mustard and green onions; mix well.
Potatoes can be served at this point.
Heat oven to 375 degrees F.
Lightly oil 1 1/2-quart baking dish.
Place potato mixture into prepared dish.
Beat egg whites until very stiff and spread over potatoes.
Bake 50 to 60 minutes and serve immediately.